Status

()

For bugs in Firefox Desktop, the Mozilla Foundation's web browser. For Firefox user interface issues in menus, developer tools, bookmarks, location bar, and preferences. Many Firefox bugs will either be filed here or in the Core product. (more info)

The crashes are now gone in the current Nightly.
However, this addon doesn't seem to work correctly so maybe this bug report should be left open, maybe with updated title. Since this is a helper addon it's not very easy to pinpoint a particular misbehavior to the addon.
I use it together with the UAControl addon:
https://addons.mozilla.org/en-US/firefox/addon/uacontrol/
in which I change the UA for edition.cnn.com to Firefox Android for Tablets: Mozilla/5.0 (Android; Tablet; rv:34.0) Gecko/34.0 Firefox/34.0
With Flash disabled, http://edition.cnn.com/video/standard.html should play videos as HTML5 video. This is not the case with the latest Firefox Nightly and e10s enabled.